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• Managing an application across multiple servers, or PXE vs cfEngine/Chef/Puppet

  - by matt

  We have an application that is running on a few (5 or so and will grow) boxes. The hardware is identical in all the machines, and ideally the software would be as well. I have been managing them by hand up until now, and don't want to anymore (static ip addresses, disabling all necessary services, installing required packages...) . Can anyone balance the pros and cons of the following options, or suggest something more intelligent? 1: Individually install centos on all the boxes and manage the configs with chef/cfengine/puppet. This would be good, as I have wanted an excuse to learn to use one of applications, but I don't know if this is actually the best solution. 2: Make one box perfect and image it. Serve the image over PXE and whenever I want to make modifications, I can just reboot the boxes from a new image. How do cluster guys normally handle things like having mac addresses in the /etc/sysconfig/network-scripts/ifcfg* files? We use infiniband as well, and it also refuses to start if the hwaddr is wrong. Can these be correctly generated at boot? I'm leaning towards the PXE solution, but I think monitoring with munin or nagios will be a little more complicated with this. Anyone have experience with this type of problem? All the servers have SSDs in them and are fast and powerful. Thanks, matt.

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• Firebox 1250e Core Failing?

  - by Noah

  We have 2 Firebox 1250e Core firewall boxes in our production environment, serving as an active and passive mode. A few months back, the active box was flashing a warning light, so our consultant removed it, and plugged it in to a test network. Everything appeared to be working fine, so he reloaded it into the production environment, and we didn't see any other issues. Fast forward to last week, and out network was constantly dropping connections over RDC, timing out, and performing as if there was a traffic issue. I turned off the production box and everything began to work fine immediately. At this point though, I'm not sure how to proceed. Should the box be completely replaced? Is there any recommended testing we could do to determine if there is a failure of some type with this device? Should we try upgrading the software on it? I know the environment isn't the issue, since the passive box (which is now the active one) is working fine. We'd like to have 2 in production though for safety failover purposes. I am not a network admin, but am hoping someone here might be able to provide some guidance.

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• Looking for a recommendation on measuring a high availability app that is using a CDN.

  - by T Reddy

  I work for a Fortune 500 company that struggles with accurately measuring performance and availability for high availability applications (i.e., apps that are up 99.5% with 5 seconds page to page navigation). We factor in both scheduled and unscheduled downtime to determine this availability number. However, we recently added a CDN into the mix, which kind of complicates our metrics a bit. The CDN now handles about 75% of our traffic, while sending the remainder to our own servers. We attempt to measure what we call a "true user experience" (i.e., our testing scripts emulate a typical user clicking through the application.) These monitoring scripts sit outside of our network, which means we're hitting the CDN about 75% of the time. Management has decided that we take the worst case scenario to measure availability. So if our origin servers are having problems, but yet the CDN is serving content just fine, we still take a hit on availability. The same is true the other way around. My thought is that as long as the "user experience" is successful, we should not unnecessarily punish ourselves. After all, a CDN is there to improve performance and availability! I'm just wondering if anyone has any knowledge of how other Fortune 500 companies calculate their availability numbers? I look at apple.com, for instance, of a storefront that uses a CDN that never seems to be down (unless there is about to be a major product announcement.) It would be great to have some hard, factual data because I don't believe that we need to unnecessarily hurt ourselves on these metrics. We are making business decisions based on these numbers. I can say, however, given that these metrics are visible to management, issues get addressed and resolved pretty fast (read: we cut through the red-tape pretty quick.) Unfortunately, as a developer, I don't want management to think that the application is up or down because some external factor (i.e., CDN) is influencing the numbers. Thoughts? (I mistakenly posted this question on StackOverflow, sorry in advance for the cross-post)

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• Browser says "Waiting for www.xyz.com" for a very long time

  - by Phil

  When I load my website (hosted with Ipage). The browser often takes an incredible long time saying "Waiting for www.xyz.com ..." before any elements of the site actually appear. After this "Waiting for" process, the text, images and everything else actually load quite fast. I contacted my host with my tracert result and they said they optimized my website database and increased the memory available to PHP on my account to 64 Mb.They also said they have checked the issue by accessing my website and found that it is loading fine without any slowness. It seems to be a temporary issue. Please try to access your website with different browser and network. I tried different browsers and networks but this "Waiting for" process always takes too long. My website is http://www.surreyextra.com/ . It's Wordpress and BuddyPress. I'm in the UK while Ipage host is placed in the USA, can this potentially be a problem? I have tried a number of optimizations, like minifying my CSS and JS files and use catching but the problem hasn't improved. So is it my host's fault, should I contact them again?

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• XP Pro freezes on welcome screen

  - by Peter B

  I have a problem that sounds much the same as http://superuser.com/questions/83101/how-to-diagnose-a-freeze-on-startup-in-windows-xp About every 2nd or 3rd boot, XP-Pro freezes on the Welcome page (the one showing the user name icons). The mouse moves the cursor OK, but clicking on an icon does nothing, and neither does any keystroke. If you press too many keys there is a beep and after that the mouse won't move the cursor anymore. The work-around is always to reboot into Safe mode and request a CHKDSK /R After this, the next boot is fine. There are no related entries in the Event log when the problem occurs. The only two entries are: "Microsoft (R) Windows (R) 5.01. 2600 Service Pack 3 Multiprocessor Free." "The Event log service was started." Update 1: Many thanks for that but I found no problems with any diagnostics I have run. But, I have managed to locate, and code round, the source of the problem - which is with whatever processing goes on behind the XP Welcome (as opposed to "classic") login screen. Unfortunately, having classic login means you don't get the useful Fast User Switching (FUS) login/switch mode. So, to retain this, my fix is: Add a Windows shutdown script (using gpedit.msc) to force "classic" mode for the first logon after next XP startup, by running: reg add "hklm\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /v LogonType /t REG_DWORD /d 0 /f Add a Scheduled Task to run at User Logon that enables Welcome screen (and hence FUS) by running the same command with 1 instead of 0 after the /d flag. The task is run as a privileged user (who can run "reg add").

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• Time sync fails on Hyper-V VM, but succeeds when I log in as a domain user

  - by Richard Beier

  We have a Windows Server 2003 SP2 VM running on Hyper-V (Server 2008 R2 host). The VM has Hyper-V time synchronization enabled. I noticed that the time on the VM was fast by around 25 minutes. I saw the following in the event log: The time provider NtpClient is configured to acquire time from one or more time sources, however none of the sources are currently accessible. No attempt to contact a source will be made for 15 minutes. NtpClient has no source of accurate time. The time provider NtpClient cannot reach or is currently receiving invalid time data from ourdc.ourdomain.local (ntp.d|192.168.2.18:123-192.168.2.2:123). Time Provider NtpClient: No valid response has been received from domain controller ourdc.ourdomain.local after 8 attempts to contact it. This domain controller will be discarded as a time source and NtpClient will attempt to discover a new domain controller from which to synchronize. I had been logged in as a local user. (We have an old app that runs on this VM - it requires a user to be logged in at all times, and we use a non-domain user account for this.) When I logged in as a domain user, the clock almost immediately corrected itself. Running "w32tm /monitor" and "net time" as the domain user showed no errors, and indicated that our domain controller was the time source. Does anyone know what might cause this, and why logging in under a domain account fixes the problem? I'm wondering if the time will start to drift again. Thanks for your help, Richard

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• What laptop would be recommended for video-editing or transcoding to blu-ray?

  - by Rob

  I'm looking for a machine (has to be a laptop) reasonably fast enough to handle editing/transcoding/rendering to Blu-ray disc of full true HD 1080p (1920x1080) video from a Samsung R10 camcorder - MPEG4 25fps (not the Sony-Panasonic AVCHD format): To be able to browse through the footage (say, quarter screen is fine for monitoring) and do simple edits - cut out bad bits, add titles, fades, nothing too fancy To be able to burn the footage in 1920x1080p 24p (twenty-four) fps to blu-ray, probably don't mind if I have to leave it for a few hours, or even overnight, as long as its not still running in the morning or takes days. I ALREADY have an external USB 2.0 LG BE06LU10 blu-ray burner. Does quad core make much difference? Or would Dual-core suffice for the above? NVidia because of CUDA for increased speed. What software today can take advantage of this? Which graphics card do I need? So far I've found Dell/Alienware to be well-specified, having a 5yr old Dell laptop that still runs well, albeit slow by today's standards, gives me a good impression. My concerns are too much fan-noise and budget and some Dell Precision Laptops exceed 1500 pounds. Thoughts?

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• Why is my mono/XSP site loading slow?

  - by acidzombie24

  I have two sites on the same server. One is loading perfectly and incredibly fast. The other is an equally complex site except a bit less javascript and 0 images. Its taking several seconds to load and there is a 1 in 3 chance that i get a Http500 error. WTF I grabbed the lastest 2.6.? version of mono, mod_mono and xsp (libgdiplus-2.6.7, xsp-2.6.5, mod_mono-2.6.3 and mono 2.6.7) This is whats in apache error.log [Mon Jan 03 19:33:40 2011] [error] (70014)End of file found: read_data failed [Mon Jan 03 19:33:40 2011] [error] Command stream corrupted, last command was 1 [Mon Jan 03 19:34:52 2011] [error] (70014)End of file found: read_data failed [Mon Jan 03 19:34:52 2011] [error] (70014)End of file found: read_data failed [Mon Jan 03 19:34:52 2011] [error] Command stream corrupted, last command was 1 [Mon Jan 03 19:34:52 2011] [error] Command stream corrupted, last command was 1 this is the page error Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator, webmaster@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error. More information about this error may be available in the server error log. Apache/2.2.9 (Debian) PHP/5.2.6-1+lenny9 with Suhosin-Patch mod_mono/2.6.3 Server

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• Testing for disk write

  - by Montecristo

  I'm writing an application for storing lots of images (size <5MB) on an ext3 filesystem, this is what I have for now. After some searching here on serverfault I have decided for a structure of directories like this: 000/000/000000001.jpg ... 236/519/236519107.jpg This structure will allow me to save up to 1'000'000'000 images as I'll store a max of 1'000 images in each leaf. I've created it, from a theoretical point of view seems ok to me (though I've no experience on this), but I want to find out what will happen when there will be directories full of files in there. A question about creating this structure: is it better to create it all in one go (takes approx 50 minutes on my pc) or should I create directories as they are needed? From a developer point of view I think the first option is better (no extra waiting time for the user), but from a sysadmin point of view, is this ok? I've thought I could do as if the filesystem is already under the running application, I'll make a script that will save images as fast as it can, monitoring things as follows: how much time does it take for an image to be saved when there is no or little space used? how does this change when the space starts to be used up? how much time does it take for an image to be read from a random leaf? Does this change a lot when there are lots of files? Does launching this command sync; echo 3 | sudo tee /proc/sys/vm/drop_caches has any sense at all? Is this the only thing I have to do to have a clean start if I want to start over again with my tests? Do you have any suggestions or corrections?

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• How do I fix a super slow MacBook?

  - by MakingScienceFictionFact

  I'm running a black MacBook 4.1. Intel Core 2 Duo @ 2.4 GHz, 2 GB RAM, 250 GB hard disk drive, bus speed is 800 MHz. It's about three years old in excellent shape externally. I treat this thing like a baby. It used to run awesome, but now it's super slow at everything. I get the spinning pizza of death constantly. It takes a long time to boot up or load any program, even Safari and iTunes. iPhoto is terribly slow. The Internet doesn't work properly and it reminds me of a buggy PC. I've formatted it and re-installed Mac OS X 10.6 (with all updates), and I've done the disk repairs process. As an iOS developer this is driving me crazy, but luckily I have an iMac to work on in the day which is fast. I'm ready to format it again, but that didn't work last time. After the last format, I copied back files from an external drive so maybe the offending files were hidden in there somewhere. Here are the hard disk drive and RAM specifications. It is upgrade-able to 4 GB of RAM. Hard disk drive: The Fujitsu Mobile MHY2250BH is a 250 GB, standard hard disk drive. Its burst transfer rate is 150 Mbyte/s. This is a 5400 RPM drive and comes with an 8 MB buffer. RAM: two sticks of 1 GB DDR2 SDRAM, speed: 667 MHz.

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• tod to avi mpg wmv, convert tod (.mpeg-2) to avi mpg wmv for Movie Maker.

  - by yearofhao

  Need to convert .tod (mpeg-2) to avi mpg wmv download from JVC Everio to PC with tod to avi mpg wmv converter convert tod to uncompressed/raw avi, mpg wmv Have a JVC Everio camcorder? Then you may encounter problems when saving the .tod files to your computer windows movie maker says it can't recognize and edit them to make videos. You may play them using media player but the problem is how to edit them? The bundled software Power cinema could be annoying, since you can only edit when the camera is plugged in to the PC - Power cinema can’t seem to edit from the saved clips alone. So, how do you save them to PC so that you can edit them without the camera and also using windows movie maker? JVC Everio Tod to avi mpg wmv converter costs you a penny to but help you perfectly convert tod file to AVI, MPG, WMV, YouTube FLV, MP4, DV, QuickTime.MOV or other common video formats with fast speed and while keeping the original HD quality. High definition TOD recordings from JVC Camcorders can playback fluidly, convert smoothly and edit professionally on with iOrgsoft TOD file converter iOrgsoft tod to avi mpg wmv Converter has been mostly used by Windows users who use Windows 7 or Vista, after the .tod (mpeg-2 the same codec) downloaded from JVC Everio to PC, it’s best to convert tod to avi, convert to xvid divx, convert tod to uncompressed avi or convert tod to raw avi, tod to mpg, tod to wmv, which are three Windows movie maker best formats to import. TOD to avi mpg wmv converter is a competent video-editing program that allows you to clip/cut TOD video clip, crop the video to encode, and help transfers video to devices like iPhone, iPod, to HDTV connected with Apple TV.

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• Why is my connection slow?

  - by Jay R.

  I have a Dell Precision T5400 with a Broadcom 1Gb onboard NIC. For some strange reason, when I access machines on our local network, the best I can get is around 125KB/s download speed. My laptop that has a 10/100Mb NIC onboard usually gets around 300KB/s or better from the same network resource. Both machines are plugged into the same 1Gb switch which connects to our local network wall jack at 100Mb half duplex. There is also a printer plugged into the same switch at 100Mb full. The resource I'm using for the test is a 30MB zip file copied from a jetty webserver that is running as part of a cruisecontrol installation. The cruisecontrol installation is running WindowsXP with full real-time antivirus and Altiris patch management and inventory running. That stuff on its own is eating some of the download speed. I've seen the laptop reach into the multiple MB/s download speed before, but the desktop never seems to get past 125KB/s to 130KB/s. In WindowsXP, before I upgraded the driver in the desktop, it was that slow. In Fedora, it is still slow even though it appears to be using the same driver version as the upgraded Windows driver. The upgraded Windows driver is faster, but still not nearly as fast as the laptop. What gives? Any insight to improve the situation would be appreciated. Could it be that the BroadCom board just isn't that good, or the driver in linux is just not as good as the Windows one?

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• Tool for search, watch and download youtube videos on Ubuntu

  - by Mike

  I am looking for a tool like MacTubes for Ubuntu. MacTubes is a mac app that can search, watch and download youtube videos. The great advantage of this app is that it searches youtube and shows all videos available there and allows you to select all and download everything fast and easy. MacTubes is so awesome that it also converts the video to MP4 and downloads the HD version of a video when available. I use this on my mac, but my sister uses Linux and I am looking for something like that for her. I have tried Miro, but Miro's search feature is bad as hell. I search for something using MacTubes and it shows me 1600 results. The same search under Miro shows me 40 results. Miro never shows more than one page of results. I prefer it to be an application with a GUI, instead of command line, because my sister's proficiency in Linux is not that good. Any suggestions? Thanks.

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• Copy past speed very slow for a large number of tiny files on Windows but not on linux

  - by Arno2501

  I've got this folder which contains 15'000 of tiny images (around 400 bytes each). If I copy past this folder on my laptop (Windows 7, i7 latest gen, superfast ssd) it takes about 30 seconds (yes for 7 megs !!!) the average transfer rate is 400 KBytes / second which is so slow. I mean my usual transfer rate is more like hundreds of MBytes per second !!! I get the same problem on my servers (Windows 2003, 2008 /r2) and on every Windows box that I could get my hands on. On the other hand if I do the same on a linux box (debian base, Ext3 FS) (which runs on the same SAN than all the windows servers I've tested) It's nearly instantaneous !!! I'm pretty sure the size / number of the files may stress such filesystem more than another but such differences !? Why is that ? Why is it so slow on the windows boxes (more that 30 sec for 7 MB) and so fast on the linux ones (one sec or so) (I mean this was not a hardlink that I've created it was a true copy). Is it a normal behaviour or something unusual ?

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• Getting Dell E6320 with I7 to work with 3 monitors at 1920x1080p x 3

  - by MadBoy

  I want to buy Dell E6320 which comes with Intel Core I7-2620M (2.70GHz, 4MB cache, Dual Core) with Intel HD Graphics 3000. Laptop will come with docking station. I want to connect 3 monitors to that docking station so that working at home would give me some additional boost. Docking station will allow me to connect only 2 monitors so I'm looking at following other options: Matrox TRIPLEHEAD2GO DIGITAL Edition or TRIPLEHEAD2GO DP Edition. But reading Matrox Support Page intel GPU can't run the highest resolution with 3 monitors connected, it even gets worse since it seems monitors would have to be able to work at 50hz. Also I'm not sure but it seems that Matrox doesn't split the monitors as 3 separate monitors but simply as one big space (which is a bit opposite to what I need) Buy 2 or maybe just 1 USB based monitor but it would also mean having 1 or 2 different monitors then the main one, unless I buy 3 USB based monitors which would mean more money to spend. Also I found only couple of models and most of them require USB 3.0 and no other cables to plug in (nice but costly - couldn't find decent monitor with only USB for sending signal and having power connected normally) . But docking station has only one USB 3.0 port. Can I use hub and still get it to work? Find some converters from Digital to USB (I think DisplayLink does some?) Buy different laptop but what kind? I need it to be I7, small (13"), fast and lightweight. At same time it requires docking station that I can use at home to connect 3 external monitors. Some other suggested solution... Edit: I need 3 monitors for work in terms of coding in Visual Studio or having word/excel/outlook open. Nothing fancy. Maybe some movie once in a while.

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• Understanding tcptraceroute versus http response

  - by kojiro

  I'm debugging a web server that has a very high wait time before responding. The server itself is quite fast and has no load, so I strongly suspect a network problem. Basically, I make a web request: wget -O/dev/null http://hostname/ --2013-10-18 11:03:08-- http://hostname/ Resolving hostname... 10.9.211.129 Connecting to hostname|10.9.211.129|:80... connected. HTTP request sent, awaiting response... 200 OK Length: unspecified [text/html] Saving to: ‘/dev/null’ 2013-10-18 11:04:11 (88.0 KB/s) - ‘/dev/null’ saved [13641] So you see it took about a minute to give me the page, but it does give it to me with a 200 response. So I try a tcptraceroute to see what's up: $ sudo tcptraceroute hostname 80 Password: Selected device en2, address 192.168.113.74, port 54699 for outgoing packets Tracing the path to hostname (10.9.211.129) on TCP port 80 (http), 30 hops max 1 192.168.113.1 0.842 ms 2.216 ms 2.130 ms 2 10.141.12.77 0.707 ms 0.767 ms 0.738 ms 3 10.141.12.33 1.227 ms 1.012 ms 1.120 ms 4 10.141.3.107 0.372 ms 0.305 ms 0.368 ms 5 12.112.4.41 6.688 ms 6.514 ms 6.467 ms 6 cr84.phlpa.ip.att.net (12.122.107.214) 19.892 ms 18.814 ms 15.804 ms 7 cr2.phlpa.ip.att.net (12.122.107.117) 17.554 ms 15.693 ms 16.122 ms 8 cr1.wswdc.ip.att.net (12.122.4.54) 15.838 ms 15.353 ms 15.511 ms 9 cr83.wswdc.ip.att.net (12.123.10.110) 17.451 ms 15.183 ms 16.198 ms 10 12.84.5.93 9.982 ms 9.817 ms 9.784 ms 11 12.84.5.94 14.587 ms 14.301 ms 14.238 ms 12 10.141.3.209 13.870 ms 13.845 ms 13.696 ms 13 * * * … 30 * * * I tried it again with 100 hops, just to be sure – the packets never get there. So how is it that the server does respond to requests via http, even after a minute? Shouldn't all requests just die? I'm not sure how to proceed debugging why this server is slow (as opposed to why it responds at all).

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• How to slow down audio files?

  - by verve

  I need a program (with an easy learning curve) that lets me slow down mp3 (at the very least this format) music and audiobook files. The software needs to be able to slow down the audio at the chosen speeds without altering the pitch and accuracy of the words being pronounced. Perhaps like the language software "Byki Deluxe's" "SlowSound" feature? I'm learning a foreign language (German) and I find the speeds at which the books are being read too fast. I need to hear the pronunciation of each word much more clearly to learn how to pronounce the words myself. Is there such a product out there? Now, I know you can slow down stuff in VLC but it sounds really artificial. I need something that slows down audio files without altering the accuracy of the words being pronounced. It doesn't have to be freeware; ease of use and quality is more important to me. Win 7 64-bit. IE 8. Edit: Are there any software-for-pay like Audacity? Only the beta works in Win 7. Also, I'd prefer to be able to slow down a file live and not have to create a new file to use the feature.

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• Small TCP Window on WAN between 2 Locations

  - by Brent

  Site A: Denver datacenter. 60MBPS. Site B: Chicago. 100MBPS. ICMP pings: Packets: Sent = 176, Received = 176, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 74ms, Maximum = 94ms, Average = 75ms File transfer between sites that never goes past ~7MBPS: Windows Update download at 60MBPS+: Site to site: IPSec VPN using two Cisco 5520's. CPU at 3-4% and lots of memory to spare. The latency between to two sites is very acceptable so I can't see an issue why it is performing so slow when transferring between the two sites. I have found that any type of transfer (FTP, HTTP, Windows file shares) will never go above ~7MBPS. When the WAN was first setup, I was able to get transfers at 50-60MBPS, which is what is expected due to the WAN connection at the Site A at 60MBPS. Then a few days later, I was not able to get anything going faster than ~7MBPS. Is there a upstream router between Denver and Chicago causing this? I want to take the blame away from our setup as downloads from Windows Update go blazing fast and for the first few days after the site to site VPN came up, I was transferring VM images at 50-60MBPS. Our stack: HP P2000 MSA - HP C7000 Chassis - HP Flex-10 - Cisco Gigabit switch - Cisco ASA - WAN

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• Coffee spilled inside computer, damaged hard drive

  - by Harpreet

  Today coffee spilled over my table, and some of it (very less) reached the PC case placed under the table. I think little bit of it got inside the PC case through the front. As that happened the fan started running very fast and made noise. I tried to restart to see if it becomes fine, but the computer didn't start again. First it gave an error of "Alert! Air temperature sensor not detected" and didn't start. Next I tried again multiple times of starting the computer but then it gave some memory error. I was not able to start the computer. Incase there's a problem in hard disk or something related to memory, is there any way we can extract our work or data? I am scared if I am not able to extract my work in case some problem occurs like that. What options would I have? Help!! EDIT: I have attached the photo here and you can see the area spilt in red circle. The hard drive electronics have been affected and internal speaker may also have been affected. Any advise on cleaning and if hard drive can work? EDIT 2: Are there any professional services offered to extract data from blemished hard disk, like this one, in case I am not able to run it personally?

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• SQL Server becomes slow after restart

  - by Tobi DM

  I already posted this one on stackoverflow but someone gave me the hint to that I might have more luck on serverfault. We use SQL Server 2005 on an Windwos Server 2008. Ther Server has 48 GB RAM. SQL Server is configured to use 40 GB RAM. There is only one database hosted (About 70 GB). The only app beside SQL Server is our App-Server which connects the clients to the database. Now we encounter the following problem: After a restart of the server our the performance is great. The server grabs the 40 GB RAM wich it is allowed to and then runs fast as hell. But after about 4 weeks the system becomes slower and slower. The execution of statements (seen in the profiler) is raising slowly. But I cannot see that there is something going wrong on the server. CPU usage is at about 20% I/O also seems to be no Problem The process monitor does also not show that there are strange apps or something like that. Eventlog does also have no interessting messages No open transactions or blockings to see We do not use cursors in our app We tried already the following things without effect: Droped the cache by using the statements DBCC FreeProcCache DBCC FREESYSTEMCACHE('ALL') DBCC DropCleanbuffers Restarted the Appserver we are using. Restart the sql server service But nothing did help exept restarting the whole server. Any ideas?

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• Using NFS for scalable PHP/MySQL web application

  - by Jeroen Moons

  Here's the situation: I have a PHP/MySQL web application that accepts user uploads (pdf files). From these pdf files' pages a preview image is made on the fly and presented to the web app's users. Some pdfs might be on the large side, most will be under 50 MB but some extreme cases could be as large as a few hundred MB. A little waiting for the preview image for large pdf files is acceptable but no more than a minute let's say. Everything is running on one server for now, but soon the app will hit the server's limit on both storage and processing power. My idea to solve the problem: To deal with this situation I had the idea of having one or more pdf processing servers as needed, and one or more file storage servers. These two types of servers are mounted to the server on which the actual app runs using NFS. The app could then use GearMan to delegate pdf processing tasks to these processing servers. The processing server can mount the storage server and read the file stored there, process it and write its output to that server. The servers I'm talking about will be amazon ec2 instances. The web app returns a link to the resulting pdf preview image on the storage server that was used which can then be used on the front end to show the image to the user. My question: I have zero experience with apps that use multiple servers, is this idea viable or is there a better way to do it? Is an NFS setup fast and reliable enough for this situation?

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• Homebrew large data cluster access for 2 user levels?

  - by Yegor

  The title probably makes little sense, so here is an example. I have a file hosting site, that serves a large amount of semi-randomly accessed files. The setup is as follows: High horsepower front-end +DB server that also does encoding for files that need encoding Fresh file server, which stores newly uploaded content, thats probably (and usually) rapidly accessible, which has 500GB of raided SSD storage, that can push over 3GBit of traffic. 3 cheap node servers, containing 2 x 750GB SATA drives in raid1, where files older than 2 weeks are archived, from the SSD server (mentioned above). Files on each server are accessed via subdomains (via modsec) in a straight forward fashion (server1.domain.com, server2.domain.com, etc) Where I have the problem is this. I introduced a "premium" service where people pay a small fee every month, and get ad-free, quick accesses to stuff on the site. Once they are logged in, they access same files via premium.server1.domain.com via a different modsec script, with a different pass phrase. That all works fine and dandy.... except the cheap node servers are all IO bound, so accessing the files on them via a different, unsaturated network makes no difference, since it cannot read off the drive fast enough. What would be a good way to make files on the site be accessible via 2 different network routes, 1 of which will be saturated (the "free network") while all other files are on an un-saturated "premium" network?

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• Win7 VM @ ESXi Server @ VMWorkstation (Win7) - ping works only from VM -> HostOS, not vice versa

  - by DK2000

  right now I'm toying around with VM Ware stuff and not having any pcs then my laptop I decided to run an ESXi Server inside of VWmware Workstation. I was just curios to see if the server would allow to setup and run a VM. And after some tweaking there it was, working like a charm. Okay not that fast but startin' the VM from vSphere and "opening a console" gave my direct access to that VM. Now I wanted to see if I could ping the host from the VM (VM Workstation Network is set to "host only"). And it worked, at least from the VM I could ping the ESXi server and the host. From the host I am able to ping the ESXi Server but I can't ping the VM! I asked myself anyway where the VM got its ip adress from. At the DCHPs IP there is at no machine after all. I even tried to use that DHCP adress for my Host and it didn't work out. You can see my settings from the screenshot here (it's pretty wide so just a link): http://yfrog.com/n4desktopfeop The only thing that got me thinking was when I once changed the ESXi's IP from 192.168.92.137 to 192.168.0.137. I still was able to connect to the ESXi server via its new IP but when I tried to run the VM console from vSphere I got an error after a while that said "couldnt connect to 192.168.92.137:903". So vSphere connects just through a port of the ESXi server to the VM?!? Could I setup a Linux VM to use it as a DHCP that I'd at least have control over the IPs that are given. Which lowest end linux could be used for this purpose?!? Thank you for your time! :)

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• heavy load on mysql

  - by payal

  i have dedicated server with very good configuation like 16 gb ram etc but i am facing heavy load from mysql however only one database is running and 5-10 pages are only running. However whm load is always less than one but when i click on whm load it shows 20% of cpu usage by mysql and after some time it starts saying can not connect to mysql . mysql server has gone away 1691 (Trace) (Kill) mysql 0 19.2 2.7 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --log- error=/var/lib/mysql/server.xyz.com.err --pid-file=/var/lib/mysql/server.xyz.com.pid i have tested static pages they are coming blezing fast but all dynamic pages which are using mysql is coming damn slow it takes years to open.. ihave checked log error file it says nothing.i have increased maximum connnection also to 1000 but still same problem is there .if i disconnect that one databasejust by changing the name of database i can see withing half hour the load of server and mysql goes down to negliglble .i have tested everything and if there are some query which can cause heavy load to server can you please list which type of query can cause heavy load on server then also for 5-10 pages it will never cause that much heavy load. i have seen server with 500 websites but was working just fine.

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• heavy load on mysql

  - by payal

  i have dedicated server with very good configuation like 16 gb ram etc but i am facing heavy load from mysql i am running a music wesbite however only one database is running and 5-10 pages are only running.when i click on whm show processlist it shows only 2-3 processes However whm load is always less than one but when i click on whm load it shows 20% of cpu usage by mysql and after some time it starts saying can not connect to mysql . mysql server has gone away 1691 (Trace) (Kill) mysql 0 19.2 2.7 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --log- error=/var/lib/mysql/server.xyz.com.err --pid-file=/var/lib/mysql/server.xyz.com.pid i have tested static pages they are coming blezing fast but all dynamic pages which are using mysql is coming damn slow it takes years to open.. my.conf file is [mysqld] key_buffer = 1536M max_allowed_packet = 1M max_connections = 250 max_user_connections = 15 wait_timeout=40 connect_timeout=10 table_cache = 512 sort_buffer_size = 2M read_buffer_size = 2M read_rnd_buffer_size = 8M myisam_sort_buffer_size = 64M thread_cache_size = 8 query_cache_size = 32M server-id = 14 old-passwords = 1 [mysqldump] quick max_allowed_packet = 16M [mysql] no-auto-rehash [myisamchk] key_buffer = 256M sort_buffer_size = 256M read_buffer = 2M write_buffer = 2M [mysqlhotcopy] interactive-timeout ihave checked log error file it says nothing.i have increased maximum connnection also to 1000 but still same problem is there .if i disconnect that one databasejust by changing the name of database i can see withing half hour the load of server and mysql goes down to negliglble .i have tested everything and if there are some query which can cause heavy load to server can you please list which type of query can cause heavy load on server then also for 5-10 pages it will never cause that much heavy load. i have seen server with 500 websites but was working just fine.

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